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Abstract

Slow light based on transient spectral hole-burning is reported for emerald, Be3Al2Si6O18:Cr3+. Experiments were conducted in π polarization on the R1(±3/2) line (E2←A24) at 2.2 K in zero field and low magnetic fields B‖c. The hole width was strongly dependent on B‖c, and this allowed us to smoothly tune the pulse delay from 40 to 154 ns between zero field and B‖c=15.2mT. The latter corresponds to a group velocity of 16km/s. Slow light in conjunction with a linear filter theory can be used as a powerful and accurate technique in time-resolved spectroscopy, e.g., to determine spectral hole-widths as a function of time.

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